Characteri sti cs of Irradi ated Hydrogel Formulated from Composite τ/κ-carrageenan Combined with Polyvinyl Alcohol

Abstract

Eucheuma seaweed from tropical waters habitat mainly contains carrageenan, a type of hydrocolloid potential for hydrogel production. This study aims to determine the characteristics of hydrogel formulated from composite τ-and κ-carrageenan combined with polyvinyl alcohol (PVA) which, could be used further for wound dressing application. The concentrations of composite τ/κ-carrageenan used were 1.0%, 1.5%, 2.0%, 2.5% and 3.0% w/w, and the PVA concentration was 12.5% w/w. Composite τ/κ-carrageenan in a proportion of 6:4 by weight. The hydrogel was irradiated using60Co γ-rays with the irradiation dose of 25 and 2 kGy.h-1. The concentration of composite τ-and κ-carrageenan influenced the gel fraction, water holding capacity, tensile strength, elongation, and surface morphology of the hydrogel. The optimum formula of irradiated composite hydrogel was obtained from 3.0% w/w of composite τ/κ-carrageenan. The formula had a gel fraction of 61.67%, water holding capacity of 1067.12%, tensile strength of 32.37 x 10-3 MPa, and elongation of 251.67%. Interestingly, the product with the optimum formula had a porous surface morphology and transparency, which are applicable for wound dressing purposes.